#if !defined(phmap_fwd_decl_h_guard_)
#define phmap_fwd_decl_h_guard_

// ---------------------------------------------------------------------------
// Copyright (c) 2019, Gregory Popovitch - greg7mdp@gmail.com
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//      https://www.apache.org/licenses/LICENSE-2.0
// ---------------------------------------------------------------------------

#ifdef _MSC_VER
#pragma warning(push)
#pragma warning(disable : 4514) // unreferenced inline function has been removed
#pragma warning(disable : 4710) // function not inlined
#pragma warning(disable : 4711) // selected for automatic inline expansion
#endif

#include <memory>
#include <utility>
#include <mutex>

#if defined(PHMAP_USE_ABSL_HASH) && !defined(ABSL_HASH_HASH_H_)
namespace absl {
	template <class T> struct Hash;
};
#endif

namespace phmap {

#if defined(PHMAP_USE_ABSL_HASH)
	template <class T> using Hash = ::absl::Hash<T>;
#else
	template <class T> struct Hash;
#endif

	template <class T> struct EqualTo;
	template <class T> struct Less;
	template <class T> using Allocator      = typename std::allocator<T>;
	template<class T1, class T2> using Pair = typename std::pair<T1, T2>;

	class NullMutex;

	namespace priv {

// The hash of an object of type T is computed by using phmap::Hash.
		template <class T, class E = void>
		struct HashEq {
			using Hash = phmap::Hash<T>;
			using Eq   = phmap::EqualTo<T>;
		};

		template <class T>
		using hash_default_hash = typename priv::HashEq<T>::Hash;

		template <class T>
		using hash_default_eq = typename priv::HashEq<T>::Eq;

// type alias for std::allocator so we can forward declare without including other headers
		template <class T>
		using Allocator = typename phmap::Allocator<T>;

// type alias for std::pair so we can forward declare without including other headers
		template<class T1, class T2>
		using Pair = typename phmap::Pair<T1, T2>;

	}  // namespace priv

// ------------- forward declarations for hash containers ----------------------------------
	template <class T,
	          class Hash  = phmap::priv::hash_default_hash<T>,
	          class Eq    = phmap::priv::hash_default_eq<T>,
	          class Alloc = phmap::priv::Allocator<T>>  // alias for std::allocator
	class flat_hash_set;

	template <class K, class V,
	          class Hash  = phmap::priv::hash_default_hash<K>,
	          class Eq    = phmap::priv::hash_default_eq<K>,
	          class Alloc = phmap::priv::Allocator<
	              phmap::priv::Pair<const K, V>>> // alias for std::allocator
	              class flat_hash_map;

	          template <class T,
	                    class Hash  = phmap::priv::hash_default_hash<T>,
	                    class Eq    = phmap::priv::hash_default_eq<T>,
	                    class Alloc = phmap::priv::Allocator<T>> // alias for std::allocator
	          class node_hash_set;

	          template <class Key, class Value,
	                    class Hash  = phmap::priv::hash_default_hash<Key>,
	                    class Eq    = phmap::priv::hash_default_eq<Key>,
	                    class Alloc = phmap::priv::Allocator<
	                        phmap::priv::Pair<const Key, Value>>> // alias for std::allocator
	                        class node_hash_map;

	                    template <class T,
	                              class Hash  = phmap::priv::hash_default_hash<T>,
	                              class Eq    = phmap::priv::hash_default_eq<T>,
	                              class Alloc = phmap::priv::Allocator<T>, // alias for std::allocator
	                              size_t N    = 4,                  // 2**N submaps
	                              class Mutex = phmap::NullMutex>   // use std::mutex to enable internal locks
	                    class parallel_flat_hash_set;

	                    template <class K, class V,
	                              class Hash  = phmap::priv::hash_default_hash<K>,
	                              class Eq    = phmap::priv::hash_default_eq<K>,
	                              class Alloc = phmap::priv::Allocator<
	                                  phmap::priv::Pair<const K, V>>, // alias for std::allocator
	                              size_t N    = 4,                  // 2**N submaps
	                              class Mutex = phmap::NullMutex>   // use std::mutex to enable internal locks
	                    class parallel_flat_hash_map;

	                    template <class T,
	                              class Hash  = phmap::priv::hash_default_hash<T>,
	                              class Eq    = phmap::priv::hash_default_eq<T>,
	                              class Alloc = phmap::priv::Allocator<T>, // alias for std::allocator
	                              size_t N    = 4,                  // 2**N submaps
	                              class Mutex = phmap::NullMutex>   // use std::mutex to enable internal locks
	                    class parallel_node_hash_set;

	                    template <class Key, class Value,
	                              class Hash  = phmap::priv::hash_default_hash<Key>,
	                              class Eq    = phmap::priv::hash_default_eq<Key>,
	                              class Alloc = phmap::priv::Allocator<
	                                  phmap::priv::Pair<const Key, Value>>, // alias for std::allocator
	                              size_t N    = 4,                  // 2**N submaps
	                              class Mutex = phmap::NullMutex>   // use std::mutex to enable internal locks
	                    class parallel_node_hash_map;

	                    // -----------------------------------------------------------------------------
	                    // phmap::parallel_*_hash_* using std::mutex by default
	                    // -----------------------------------------------------------------------------
	                    template <class T,
	                              class Hash  = phmap::priv::hash_default_hash<T>,
	                              class Eq    = phmap::priv::hash_default_eq<T>,
	                              class Alloc = phmap::priv::Allocator<T>,
	                              size_t N    = 4>
	                    using parallel_flat_hash_set_m = parallel_flat_hash_set<T, Hash, Eq, Alloc, N, std::mutex>;

	                    template <class K, class V,
	                              class Hash  = phmap::priv::hash_default_hash<K>,
	                              class Eq    = phmap::priv::hash_default_eq<K>,
	                              class Alloc = phmap::priv::Allocator<phmap::priv::Pair<const K, V>>,
	                              size_t N    = 4>
	                    using parallel_flat_hash_map_m = parallel_flat_hash_map<K, V, Hash, Eq, Alloc, N, std::mutex>;

	                    template <class T,
	                              class Hash  = phmap::priv::hash_default_hash<T>,
	                              class Eq    = phmap::priv::hash_default_eq<T>,
	                              class Alloc = phmap::priv::Allocator<T>,
	                              size_t N    = 4>
	                    using parallel_node_hash_set_m = parallel_node_hash_set<T, Hash, Eq, Alloc, N, std::mutex>;

	                    template <class K, class V,
	                              class Hash  = phmap::priv::hash_default_hash<K>,
	                              class Eq    = phmap::priv::hash_default_eq<K>,
	                              class Alloc = phmap::priv::Allocator<phmap::priv::Pair<const K, V>>,
	                              size_t N     = 4>
	                    using parallel_node_hash_map_m = parallel_node_hash_map<K, V, Hash, Eq, Alloc, N, std::mutex>;

	                    // ------------- forward declarations for btree containers ----------------------------------
	                    template <typename Key, typename Compare = phmap::Less<Key>,
	                              typename Alloc = phmap::Allocator<Key>>
	                    class btree_set;

	                    template <typename Key, typename Compare = phmap::Less<Key>,
	                              typename Alloc = phmap::Allocator<Key>>
	                    class btree_multiset;

	                    template <typename Key, typename Value, typename Compare = phmap::Less<Key>,
	                              typename Alloc = phmap::Allocator<phmap::priv::Pair<const Key, Value>>>
	                                      class btree_map;

	                              template <typename Key, typename Value, typename Compare = phmap::Less<Key>,
	                                        typename Alloc = phmap::Allocator<phmap::priv::Pair<const Key, Value>>>
	                                                class btree_multimap;

}  // namespace phmap


#ifdef _MSC_VER
#pragma warning(pop)
#endif

#endif // phmap_fwd_decl_h_guard_
